Troubleshooting - Edwards ModuLaser Installation Manual

Troubleshooting

This section provides some possible solutions if a problem should occur with
your detection system. If the problem is not included here or, if after performing
the suggested actions, the problem persists, contact your technical support
office.
Table 32: Troubleshooting guide
Problem Corrective action
Nuisance alarms Check that the ClassiFire alarm factor setting is appropriate for the normal
occur too often working environment of the protected area. Check that the detector is not
in demonstration mode. This can be ascertained by viewing the event log
and checking that the entry Demo mode has a higher log entry number
than the most recent FastLearn start and FastLearn end entries.
Remember that the log entries are in reverse order, with the most recent
entries appearing first. If the log shows that demonstration mode was
invoked during the last FastLearn period, start a new FastLearn and allow
it to complete its 24-hour cycle.
From the event log, check that at least 24 hours have elapsed since the
last FastLearn end entry.
Check that day/night switchover times are appropriately set to reflect active
and non-active periods.
Elevated smoke Check that detector is not disabled or in FastLearn (if disabled, the fault
levels do not indicator will be lit).
generate alarms
Check that the detector sampling points are in the smoke stream.
Check that the correct ClassiFire alarm setting has been set.
Check that the detector has either had a 24-hour learning period or that it
has been placed in demonstration mode.
Low mean output Check that the dust filter does not require changing and that the air plenum
chamber is clean. The chamber may become clogged when, for example,
heavy building activity has occurred near the sampling pipes. If so, the
chamber may require factory service. The detector is not designed to
handle large quantities of coarse debris and dust.
Detector sensitivity There are many reasons why particle densities may vary, and the
varies over time ClassiFire system automatically compensates for this in order to replace
the likelihood of nuisance alarms due to normal variations in background
smoke density. Within limits set by the ClassiFire alarm factor, this is a
normal part of the detector's operation.
Flow fault errors These occur when the airflow rate into the detector exceeds the
preprogramed parameters. As the detector "learns" the flow setup from the
initial installation, this usually means that there has been some change in
conditions. A Flow High fault may indicate that a sampling pipe is
damaged, and a Flow Low fault may indicate that the pipe has been
blocked (for example, by nearby building operations).
If the detector input is sampled from one area and the exhaust is in another
area with different pressure (for example, the detector is in a roof space
and sampling from an enclosed room), this may lead to flow faults. In this
case, it would be necessary to lead a pipe from the exhaust to the
protected area to ensure nominal flow.
ModuLaser Modular Aspirating Smoke Detector Installation Manual
Chapter 4: Maintenance and troubleshooting
83